Close-coupled catalytic converter system

Power plants – Internal combustion engine with treatment or handling of... – Methods

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Details

60288, 422171, 422176, F01N 320, F01N 328

Patent

active

058507345

ABSTRACT:
The instant invention is directed at an in-line engine exhaust system comprised of the following: (1) a first close-coupled catalyzed structure located in the exhaust stream, the catalyzed structure having an inlet and an outlet end disposed in a housing, a lightoff temperature, and comprising a first substantially unobstructed flow region, and a second more obstructed flow region abutting the first region, the first region being disposed to provide a substantially unobstructed flow path for exhaust gases in the exhaust gas stream; and, (2) a flow diverter connected to a secondary air source and disposed in the housing for diverting the exhaust gases away from the first region. Furthermore, the exhaust system may be provided with a second catalyzed structure located in the exhaust gas stream downstream from the housing. Also disclosed herein is a method of treating a hydrocarbon-containing engine exhaust steam utilizing the aforementioned inventive exhaust system.

REFERENCES:
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patent: 5277026 (1994-01-01), Boll et al.
patent: 5603216 (1997-02-01), Guile et al.
patent: 5619853 (1997-04-01), Brown
patent: 5635141 (1997-06-01), Fischer
patent: 5657626 (1997-08-01), Brown et al.
patent: 5693294 (1997-12-01), Anderson et al.
patent: 5709081 (1998-01-01), Bruestle
patent: 5787707 (1998-08-01), Hertl

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